Estudo do desempenho estrutural de um trecho da MT-326 no município de Cocalinho - MT

Abstract

The pavement has the function of offering comfort, safety and economy to the users of the highway, and the evaluation of its performance can be functional or structural. This paper presents the structural evaluation of a section of the MT-326 in the county of Cocalinho - MT, following the recommendations of the regulations DNER-PRO 011/79 and DNER-PRO 269/94. The pavement was evaluated through the global severity index (IGG), the deformation basins, the geotechnical characteristics of the materials and the study of the traffic requests. The concept of the IGG was between bad and terrible, demonstrating low levels of functional performance and indicating a possible structural commitment of the highway. The deflection values showed that few segments are in the fatigue phase, being, this result, a positive one, because it suggests that the pavement is in the elastic phase. Considering the structural evaluation and the homogeneous segments, three types of intervention were proposed, seeking to define the solution with the best cost-benefit ratio. The solution 1 consists of execute a superficial patch or a deep patch with cold premixed bituminous coating (PMF), depending on the thickness of the affected floor. After that, the microcoating or simple surface treatment (TSS) is performed to remake the texture of the existing cover; this solution is applied on the segments that needs only superficial corrections. The solution 2 comprises the reinforcement of the pavement with Hot-Machined Bituminous Concrete (CBUQ) and it is applied on the segments that needs structural reinforcement. And the solution 3, for the segments that needs reconstruction, consists on the recycling of the basis, a pavement rehabilitation technique that reuses the old coating in the granular layers, which is advantageous from the economic and environmental point of view, because it avoids the exploration of new deposit boxes and reuses the material that would be discarded, thus contributing to the preservation of the environment.